A cathode line device and dust removal equipment including the cathode line device

Abstract

The invention discloses a cathode wire device and a dust removal device comprising the cathode wire device. The cathode wire device comprises a support portion which is cylindrical; a discharge body which comprises a cylindrical main body portion and a corona head. The main body portion is cylindrical and extends along a straight line, one end face of the main body portion is welded to the support portion, and the corona head is arranged on the other end face of the main body portion away from the support portion, the corona head is spherical, and the spherical diameter of the corona head is larger than the radial dimension of the main body portion.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal and environmental protection, and in particular to a cathode ray device and dust removal equipment comprising the cathode ray device. Background Art

[0002] The cathode wire of conventional electrostatic precipitator equipment adopts different cathode wire structures according to the different dust concentrations. Common electrostatic precipitator equipment includes the front electric field, the middle electric field and the end electric field. Among them, the dust concentration in the front electric field is higher, the dust concentration in the middle electric field is lower than that in the front electric field, and the dust concentration in the end electric field is lower than that in the middle electric field. However, the dust in the end electric field is high resistivity dust. Due to this feature, the cathode wire in the end electric field needs to have the characteristics of high voltage and low current.

[0003] Common cathode wires at the end of the electric field include corrugated wires and spiral wires. During the waveform pressing process of the corrugated cathode wire, the main body often does not fit in with the support part, and the flatness is offset to form an irregular closed-loop space, resulting in the phenomenon of pole line hanging needles and closed-loop dust accumulation leading to corona closure. The spiral wire has strict requirements on the control of the tension during installation, and is often difficult to control during on-site installation. When the tension is too large, the spiral wire is easily subject to periodic stress and breaks. On the contrary, when the tension is too small, the spiral wire cannot be firmly installed on the support frame, causing the spiral wire to swing under the action of the electric field wind speed (referring to the flow speed of flue gas in the electric field of the electrostatic precipitator), thereby causing a deviation in the distance between the different poles and affecting the dust removal efficiency. In addition, when the two types of wires are matched with a 30μs narrow pulse power supply, the peak voltage is often difficult to reach the design requirement of more than 140kV, and the output current is difficult to reach the design requirement of more than 200A, which has a suppressive effect on the dust collection efficiency of the pulse power supply, and there is a problem of insufficient matching. In view of this, a technical solution is urgently needed to avoid the corona closure caused by dust accumulation on the pole wire and the breakage or swing caused by structural instability, while having good adaptability to the pulse power supply, so as to improve the dust removal efficiency. Summary of the invention

[0004] One object of the present invention is to provide a new technical solution for a cathode wire device and a dust removal device including the cathode wire device. By innovating the structure of the cathode wire device, the closed-loop dust accumulation caused by the existing waveform wire and the polarity deviation caused by the breakage or swinging of the spiral wire structure can be avoided, and the adaptability to the pulse power supply can be enhanced, thereby improving the dust removal efficiency.

[0005] According to one aspect of the present invention, a cathode line device is disclosed, which includes a support portion, which is cylindrical; a discharge body, which includes a cylindrical main body and a corona head, wherein the main body is cylindrical and extends along a straight line, one end face of the main body is welded to the support portion, and the corona head is arranged on the other end face of the main body away from the support portion, the corona head is spherical, and the spherical diameter of the corona head is larger than the radial dimension of the main body.

[0006] By adopting the above scheme, the embodiment of the present invention effectively avoids the situation where the main body and the support part are not in contact and the flatness is offset during the bending process of the corrugated line main body by directly welding one end face of the main body to the support part, and solves the problem of attenuation of vibration transmission caused by the closed-loop space formed by the main body and the support part, thereby avoiding the corona closure phenomenon.

[0007] At the same time, since the support part is cylindrical, it can be directly welded to the mounting bracket, which effectively simplifies the existing installation method and avoids the problem of spiral wire breaking or swinging caused by excessive or insufficient tension, thereby reducing or avoiding the deviation of the pole spacing and ensuring the dust removal efficiency.

[0008] In addition, a spherical discharge body is formed by providing a cylindrical support part, a cylindrical main body of the discharge body and a spherical corona head, and making the spherical diameter of the corona head larger than the radial dimension of the main body. The discharge body can form a more stable electrostatic field through spherical discharge.

[0009] At the same time, compared with the wavy and spiral cathode wire structures, the spherical corona head has a lower corona inception voltage and a higher current density. After the corona inception discharge forms a charged body, the electric field energy can be distributed on the surface of the sphere and also exists inside the sphere. Compared with other wire types, there is more electric field energy stored in the sphere. This part of energy can supplement the electric field energy on the surface of the spherical corona head, thereby making the spherical corona head discharge more smoothly than other structures, and thus making the discharge of the discharge body more stable.

[0010] Optionally, a transition portion is provided at a portion where the main body is connected to the corona head, the transition portion having a concave first arc surface, the first arc surface being concave from the outer side of the main body toward the inner side in the radial direction of the main body.

[0011] Optionally, the position where the transition part is connected to the main body has an arc to form a second arc surface, and the corona head is smoothly transitioned to the main body through the first arc surface and the second arc surface.

[0012] Optionally, an angle formed by a line connecting the arc center of the first arc surface and the arc center of the second arc surface and a radial direction of the main body is α, and 30°≤α≤60°.

[0013] Optionally, the radius r1 of the first arc surface is consistent with the radius r2 of the second arc surface.

[0014] Optionally, the sizes of r1 and r2 are 0.2mm-1.5mm.

[0015] Optionally, the difference between the ball diameter of the corona head and the radial dimension of the main body is 0.2 mm-0.5 mm.

[0016] Optionally, the axial length of the main body is 5mm-50mm.

[0017] A concave ring transition portion is provided between the corona head and the main body, and a self-cleaning ash falling angle is formed by setting a certain concave ring angle, which further amplifies the transmission of the rapping force. During the operation, the cathode line always keeps the spherical corona head clean through its own ash falling and external rapping force, thereby ensuring the discharge capacity.

[0018] In another aspect of the present invention, a dust removal device including the above-mentioned cathode wire device is provided, the device includes a front electric field, an intermediate electric field and a final electric field arranged in sequence along the direction of flue gas flow, and the cathode wire device is arranged in the final electric field; it also includes a vibration device, which can drive the cathode wire device to vibrate to achieve the purpose of cleaning.

[0019] Optionally, it further comprises a plurality of anode plates, and the cathode line device is arranged between two adjacent anode plates through a mounting bracket;

[0020] A plurality of discharge bodies of the cathode line device are arranged on both sides of the support portion in the radial direction, and adjacent discharge bodies are arranged at intervals in the axial direction of the support portion. The discharge bodies extend in a direction parallel to the anode plate.

[0021] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0023] Figure 1 is a schematic structural diagram of a spherical cathode wire device in an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A partial structural enlarged schematic diagram;

[0025] Figure 3 1 is a top view of a spherical cathode wire device according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Support part; 2. Discharge body; 21. Main body; 211. Welding pad; 22. Corona head; 23. Transition part; 231. First arc surface; 232. Second arc surface; 3. Anode plate; 4. Mounting bracket; 5. Cathode line device. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] According to one embodiment of the present application, referring to Figure 1 and Figure 2 The cathode ray device 5 in this embodiment is described. The cathode ray device 5 is used in a dust removal device. The cathode ray device 5 in the present invention includes a support portion 1 and a discharge body 2 .

[0030] Specifically, if Figure 1 As shown, the support part 1 is cylindrical, and a plurality of discharge bodies 2 are welded on the support part 1. The discharge body 2 is a spherical discharge body 2. The spherical discharge body 2 means that the volt-ampere curve of the discharge body 2 can slowly and stably climb to the peak value.

[0031] More specifically, see Figure 2 The spherical discharge body 2 includes a main body 21 and a corona head 22. The main body 21 is cylindrical and extends in a straight line. One end surface of the main body 21 is welded to the support 1. The corona head 22 is arranged on the other end surface of the main body 21 away from the support 1.

[0032] Yes, see Figure 2 A circular pad 211 is configured on the end surface where the main body 21 and the support 1 are welded, and the pad 211 is welded to the support 1 to increase the welding area and increase the connection strength between the discharge body 2 and the support 1. It is understandable that the pad 211 may not be added, and the end surface of the main body 2 may be directly welded to the support 1. Compared with the method without adding the pad 211, the discharge body structure in this embodiment can significantly increase the welding strength.

[0033] The corona head 22 is spherical, and the spherical diameter of the corona head 22 is larger than the radial dimension of the main body 21, so as to ensure that the discharge point of the discharge body 2 is always located at the position of the spherical corona head 22. The corona head 22 refers to a component that can form a corona phenomenon.

[0034] For example, the difference between the ball diameter of the corona head 22 and the radial dimension of the main body 21 is 0.2mm-0.5mm. Within the above range, the corona head 22 can be effectively ensured to be the discharge point of the discharge body 2. If it is not within the above range, the discharge point of the discharge body 2 may be easily offset.

[0035] During dust removal, the spherical corona head 22, as a convex point of the discharge body 2, can form a stable high-voltage electric field, thereby ionizing the dust to separate the dust in the airflow of the dust removal equipment. The separated dust is adsorbed under the action of the electric field.

[0036] It is understood by those skilled in the art that part of the solder will accumulate at the welding position of the main body 21 and the support part 1. Since the solder is located at the end of the main body 21 away from the corona head 22, the protrusion of the solder can be ignored and will not form a discharge point of the discharge body 2. In addition, the protrusion of the solder can be removed by a grinding process.

[0037] The cathode wire device 5 according to the embodiment of the present invention effectively avoids the situation that the main body and the support part are not in contact and the flatness is offset during the bending process of the corrugated wire main body by directly welding one end face of the main body 21 to the support part 1, and solves the problem of attenuation of vibration transmission caused by the closed-loop space formed by the main body and the support part, thereby avoiding the corona closure phenomenon.

[0038] At the same time, since the support part 1 is cylindrical, it can be directly welded to the mounting bracket 4, which effectively simplifies the existing installation method and avoids the problem of spiral wire breaking or swinging caused by excessive or insufficient tension, thereby reducing or avoiding the deviation of the pole spacing and ensuring the dust removal efficiency.

[0039] In addition, a spherical discharge body is formed by providing a cylindrical support part 1, a cylindrical discharge body body 21 and a spherical corona head 22, and making the spherical diameter of the corona head 22 larger than the radial dimension of the body 21. The discharge body can form a more stable electrostatic field through spherical discharge.

[0040] At the same time, compared with the wavy and spiral cathode wire structures, the spherical corona head 22 has a low corona inception voltage and a high current density. After the corona inception discharge forms a charge body, the electric field energy can be distributed on the surface of the sphere and also exists inside the sphere. Compared with other wire types, there is more electric field energy stored in the sphere, which can supplement the electric field energy on the surface of the spherical corona head, thereby making the spherical corona head discharge more steadily than other structures, thereby making the discharge of the discharge body more stable.

[0041] In addition, a concave ring transition portion 23 is provided between the corona head 22 and the main body 21. A self-cleaning ash falling angle is formed by setting a certain concave ring angle α, which further amplifies the transmission of the rapping force. During the operation, the cathode line can always keep the spherical corona head 22 clean through its own ash falling and external rapping force, thereby ensuring the discharge capacity.

[0042] In one example, the axial length of the main body 21 is 5 mm to 50 mm. Those skilled in the art can set the axial length of the main body 21 according to the concentration of dust.

[0043] In some embodiments, see Figure 1 and Figure 2 A transition portion 23 is provided at the portion where the main body 21 and the corona head 22 are connected, and the inner diameter of the transition portion 23 is at least smaller than the radial dimension of the corona head 22. The generator thus provided can ensure that the spherical corona head 22 of the generator discharges, thereby avoiding the radial dimension of the transition portion 23 exceeding the radial dimension of the corona head 22, which causes the discharge point to shift.

[0044] In some embodiments, the cathode line device 5 can be driven by a rapping device in the dust removal device to vibrate. The specific type of the rapping device in the dust removal device is a prior art, and those skilled in the art can choose it. The transition portion 23 has a concave first arc surface 231, and the first arc surface 231 is concave from the outside to the inside in the radial direction of the main body 21.

[0045] Specifically, the transition portion 23 is a concave cambered structure, and the inner diameter of the transition portion 23 gradually decreases and then gradually increases from the side close to the corona head 22 to the side close to the main body 21 in the axial direction of the main body 21. The outer surface of the transition portion 23 is a first cambered surface 231, and the first cambered surface 231 is connected to the corona head 22 and the main body 21 at both ends of the axial direction of the main body 21. The position where the first cambered surface 231 is connected to the corona head 22 is smoothly transitioned. For example, the position where the transition portion 23 is connected to the corona head 22 can be smoothly transitioned by a grinding process to prevent the discharge point from being offset.

[0046] When the discharge body 2 vibrates under the drive of the rapping device, the dust attached to the corona head 22 and the transition part 23 can be quickly shaken off.

[0047] The discharge body 2 thus arranged is provided with a transition portion 23 whose outer peripheral surface is a first arc surface 231, so as to connect the corona head 22 and the main body 21, so that the corona head 22 can form a smooth connection with the main body 21, thereby avoiding the formation of a connecting gap or convex ridge by directly welding the corona head 2 to the main body 21, thereby avoiding dust accumulation in the gap or convex ridge position at the connection, thereby effectively preventing dust accumulation, and further preventing the discharge body 2 from being blocked due to dust accumulation, thereby improving the dust removal efficiency.

[0048] At the same time, the structure of the discharge body 2 in the present invention is simpler, which prevents the vibration transmission force from being affected and prevents the discharge body 2 from accumulating dust.

[0049] In some embodiments, Figure 1 , Figure 2 As shown, the position where the transition portion 23 is connected to the main body 21 has an arc to form a second arc surface 232 , and the corona head 22 is smoothly connected to the main body 21 through the first arc surface 231 and the second arc surface 232 .

[0050] Specifically, the position where the transition portion 23 is connected to the main body portion 21 in the axial direction can be constructed as a curved surface by grinding to form the second curved surface 232 .

[0051] During the vibration and dust shaking process, the dust on the second curved surface 232 can slide down along the curved surface, thereby further preventing dust from accumulating at this position.

[0052] In a specific embodiment, the angle between the line connecting the arc center of the first arc surface 231 and the arc center of the second arc surface 232 and the radial direction of the main body is α, and 30°≤α≤60°.

[0053] Specifically, see Figure 2 The first arc surface 231 is concave toward the direction close to the central axis of the main body 21, and the second arc surface 232 is protruded toward the direction away from the central axis of the main body 21, so as to form an approximately S-shaped cross-sectional shape. The arc center of the first arc surface 231 and the arc center of the second arc surface 232 refer to the center positions of the circles where the first arc surface 231 and the second arc surface 232 are located.

[0054] When α is too small, the radial dimension difference between the corona head 21 and the main body 22 is small, which is easy to affect the discharge performance of the corona head 22; when α is too large, the groove of the transition part 23 is too deep, which is easy to cause dust accumulation. Therefore, when α is within the above range, the dust on the discharge body 2 is most easily shaken off, thereby improving the dust shaking efficiency.

[0055] Furthermore, α=45° to achieve the best dust shaking effect.

[0056] In a specific embodiment, the radius r1 of the first arc surface 231 is consistent with the radius r2 of the second arc surface 232 .

[0057] Specifically, see Figure 2 The arc center of the first arc surface 231 is located outside the discharge body 2, and the arc center of the second arc surface 232 is located inside the discharge body 2. The sizes of the first arc surface 231 and the second arc surface 232 thus set can simplify the processing method of the discharge body 2. At the same time, by making r1=r2, the rapping force of the rapping device can be used to the maximum extent, further improving the efficiency of dust shaking.

[0058] For example, the size of r1 and r2 is 0.2mm-1.5mm. When the size of r1 and r2 is too small, the dust shaking effect cannot be guaranteed; when the size of r1 and r2 is too large, it is easy to cause the transition part 23 to be too deep in the radial direction, resulting in an unsatisfactory dust shaking effect.

[0059] In some other embodiments of the present invention, a dust removal device including the cathode ray device 5 is provided. Figure 3 The device includes a front electric field, an intermediate electric field and a final electric field which are sequentially arranged along the direction of smoke flow, and the cathode line device 5 is arranged in the final electric field.

[0060] When removing dust in the final electric field, since the discharge body 2 of the present invention is a spherical discharge body 2, it can adapt to the characteristics of the dust in the final electric field, and can effectively target the low dust density and high resistivity of the dust in the final electric field to provide a higher secondary voltage and a lower secondary current to remove the dust in the final electric field.

[0061] It is understandable that the cathode wire device 5 of the present invention can also be used in the medium electric field. However, when the cathode wire device 5 of the present invention is used in the final electric field, it can be used to address the situation where the existing wave-shaped wire and spiral-shaped cathode wire structures cannot meet the secondary current and secondary voltage required for dust removal, thereby significantly improving the dust removal efficiency of the final electric field.

[0062] In addition, the cathode wire structure in the present invention can better match the pulse power supply in the dust removal equipment, and can stably form the secondary current and secondary voltage that meet the dust removal, so as to significantly improve the dust removal efficiency. At the same time, the spherical corona head 22 also has electric field energy inside its sphere, thereby improving the discharge efficiency and reducing the energy consumption ratio of the pulse power supply.

[0063] It is known that the dust removal equipment also includes a vibrating device, which can drive the cathode wire device to vibrate and clean the dust.

[0064] In some embodiments, see Figure 1 and Figure 3 The dust removal device includes a plurality of anode plates 3, and a cathode line device 5 is disposed between two adjacent anode plates 3 through a mounting bracket 4. A plurality of discharge bodies 2 of the cathode line device 5 are disposed on both sides of a support portion 1 in a radial direction, and adjacent discharge bodies 2 are disposed at intervals in an axial direction of the support portion 1, and the discharge bodies 2 extend in a direction parallel to the anode plates 3.

[0065] Specifically, the axially adjacent discharge bodies 2 extend in a direction away from each other in the radial direction, each discharge body 2 is arranged substantially in a direction parallel to the anode plate, and the spacing between the axially adjacent discharge bodies 2 of the support portion 1 is consistent, thereby making the field strength of the cathode line device 5 more uniform. The cathode line device 5 thus arranged can prevent the discharge bodies 2 from forming overlapping field strengths when discharging, thereby interfering with the dust removal effect.

[0066] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cathode ray device for dust removal equipment, characterized in that: include: A support portion (1), wherein the support portion (1) is cylindrical; The discharge body (2) comprises a cylindrical main body (21) and a corona head (22), wherein the main body (21) is cylindrical and extends in a straight line, one end face of the main body (21) is welded to the support part (1), and the corona head (22) is arranged on the other end face of the main body (21) away from the support part (1), and the corona head (22) is spherical, and the spherical diameter of the corona head (22) is larger than the radial dimension of the main body (21); After the corona discharge forms a charged body, the electric field energy can be distributed on the spherical surface of the corona head (22).

2. The cathode ray device according to claim 1, characterized in that: A transition portion (23) is provided at a portion where the main body (21) and the corona head (22) are connected. The transition portion (23) has a first concave arc surface (231). The first arc surface (231) is concave from the outside of the main body (21) toward the inside in the radial direction of the main body (21).

3. The cathode line device according to claim 2, characterized in that: The position where the transition part (23) is connected to the main body (21) has an arc to form a second arc surface (232), and the corona head (22) is smoothly transitionally connected to the main body (21) via the first arc surface (231) and the second arc surface (232).

4. The cathode line device according to claim 3, characterized in that: The angle formed by the line connecting the arc center of the first arc surface (231) and the arc center of the second arc surface (232) and the radial direction of the main body (21) is α, and 30°≤α≤60°.

5. The cathode line device according to claim 3, characterized in that: The radius r1 of the first arc surface (231) and the radius r2 of the second arc surface (232) are consistent in size.

6. The cathode line device according to claim 5, characterized in that: The sizes of r1 and r2 are 0.2mm-1.5mm.

7. The cathode line device according to any one of claims 1 to 6, characterized in that: The difference between the ball diameter of the corona head (22) and the radial dimension of the main body (21) is 0.2 mm to 0.5 mm.

8. The cathode line device according to any one of claims 1 to 6, characterized in that: The axial length of the main body (21) is 5 mm-50 mm.

9. A dust removal device, characterized in that: The device comprises the cathode ray device (5) according to any one of claims 1 to 8, wherein the dust removal device comprises a front electric field, an intermediate electric field and a final electric field arranged in sequence along the direction of flue gas flow, and the cathode ray device (5) is arranged in the final electric field; It also includes a rapping device, which can drive the cathode wire device to vibrate to achieve the purpose of dust removal.

10. The dust removal device according to claim 9, characterized in that: It also comprises a plurality of anode plates (3), wherein the cathode line device (5) is arranged between two adjacent anode plates (3) via a mounting bracket (4); The plurality of discharge bodies (2) of the cathode line device (5) are arranged on both sides of the support portion (1) in a radial direction, and adjacent discharge bodies (2) are arranged at intervals in the axial direction of the support portion (1). The discharge bodies (2) extend in a direction parallel to the anode plate (3).

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